Protractor welding jig



March 12, 1945- w. WIDMARK ETAL PROTRACTOR WELDING JIG Filed oct. 15, 194s Patented Max'. 12, 1946 IROTRACTOR WELDING JIG William Widmark, Duluth, Minn., andA Alberti-I. Brownlee, Superior, Wis.

Application October 15, 194:3,v Serial No. 506,456

(Cl. 11S-499) 1 Claim.

This invention relates to work stands and has special reference to such a device for use by welders especially in the art of shipbuilding where welding is now so commonly practiced, not only in the fabrication of the shipitself but in many independently fabricated accessories like gusset brackets, ller angles, round or flat bar angle brackets, bitter ends, sea chests, pad eyes, template marking and the like.

It is deemed convenient to refer to such a stand or table as a welders protractor jig as one of the principal objects of the invention is to provide a protractor disc cooperatively associated with it in such a manner as to materially augment the practicability thereof. i

A further object is to provide other cooperative brackets for selective use with and upon the jig either in conjunction with the projector or otherwise.

Other objects and advantages will appear in the further description of the invention.

Referring now to the accompanying drawing forming part of this application and in which like reference characters indicate' like parts- Figure l is a top plan view of one of the improved jigs.

Figure 2 is a side elevation of Figure 1.

Figure 3 is a perspective view of one of the brackets for cooperative association with the jig, and

Figure 4 is an elevation of the head end of the 11g.

In the drawing I represents a relatively heavy, preferably metal, flat base portion and upon which at one end is Xed in any desired manner the upstanding supporting member 2, it being spaced inwardly somewhat from what will be termed the head end of the base portion I and braced centrally upon one side as by the angle bracket 3, and both of which are securely welded to the base I.

This supporting member 2 may be of any desired length, but preferably of a height to accommodate a plurality of vertically spaced holes 4 for selective pivotal support of the arm-like member 5 of the jig, and the supporting member 2 is so positioned as to hold the arm 5 centrally and longitudinally of the base I as shown. The arm '5 is preferably somewhat shorter than said base though of quite heavy material to provide a substantial work engaging member and which may have att-ached to the free end thereof a xed leg 6 so that when mounted in the lowermost one of the holes 4 in the support 2 it may be so readily fixed in a predetermined horizontal position,

such height being that usually convenient for normal working conditions. One convenient form of pivotal support for the arm 5 is shown at 29 and which may be readily slackened ortightened for desired adjustment of thearm.

Approximately: midway the ends oi the arm-like member 5 is pivotally mounted thereupon in any desired manner as at "I the protractor disc 3B, the outer face of which may or may not have suggestive markings as indicated upon the upper half thereof in Figure 2. However, upon the circumferential surface are the graduation markings as indicated at 8 in Figure 1 preferably reading from centrally thereof to each horizontal diametrical terminus for registration with a suitable mark upon the upper edge of the arm 5 directly over each of the holes.

The protractor disc has xed to the outer face thereof the guiding blade 9 having one edge in direct vertical alignment with the center of the disc and to which any portion ci a job being worked upon may be clamped as by a common hand clamp or by hand for guidance as indicated by the preadjustment of the protractor.

Obviously the protractor disc may be removed entirely when so desired, for example when working upon a large piece of fabrication which may require same, such removal being readily accomplished by the removal of the thumb nut Il) from the pivotal pin 'i oi the disc.

The auxiliary movable bracket II is or" general L-shape though having the terminus of the upright portion of goose-neck form as at I2 for convenient overlapping engagement of the arm 5 and is longitudinally adjustable to any desired position thereupon, or removable therefrom entirely when desired.

This bracket is for support of any job of welding to which it may be adapted for holding same, said job usually being clamped thereto in some desired manner. One such clamping means is provided by having the outer extremity of the base I3 of the bracket which may rest firmly upon the base I, bent up as at Hl and carrying therethrough the squared shank Iii of the adjustable clamp i which may be moved horizontally to suit the job being held and so fastened by the thumb set screw 24.

Another form oi angle bracket which has been found of very convenient use in connection with our improved jig is shown in Figure 3 of the drawing and numbered IE. This bracket may have an elongated slot in one arm thereof as at I1 and a like slot I8 in the arm 5 is provided for selective adjustment of the bracket either vertically or horizontally when upon the arm, to accommodate different types of jobs worked upon, and to which parts thereof may be clamped. It is to be noted that the arm 5 may be swung completely over its pivotal point 2@ to accommodate a job, say adjacent the head end o1' the jig, instead of directly thereupon, and in the event of its being desired to set the arm at a predetermined angle, markings as indicated by the arrow in the lower corner of the head end of the arm 5 may be employed in conjunction with the predetermined points 2l, 22 and 23 on the support 2, thus when the arm is raised until the arrow points to 22 it may be so held at the known angle of 45 degrees by tightening of the pivotal support 28. This is more as a simple convenience in the use of the arm at angles commonly required in larger welding `jobs, and there may be provided any number of holes 25 through the arm 5 for selective positioning of the protractor thereupon.

One examplef the holding application of the clamp IS on the bracket il in conjunction with the protractor is suggested in dotted lines Figures 2 and 4, representative of two pieces of pipe being welded together at an angle of 45 degrees, and in which instance a Welders helper might readily hold the angularly disposed piece of pipe up against the lower side of the guiding blade 9 of the protractor, as shown in dotted lines, with no other clamping means necessary, for example, While tacking into position.

Having thus described our invention what we claim as new and desire to secure by Letters Patent is:

A welding jig of the type described comprising a base portion, an upright support fixed to and adjacent one end thereof and a normally horizontally disposed Work guiding arm vertically swingable and pivotally carried upon said upright support; characterized by including an adjustable work holding member slidable upon saidV base and coacting with said guiding arm, a circular protractor pivotally supported by and adjustable longitudinally of said guiding arm and a guiding blade fixed to said protractor and extending outwardly from the face thereof for angular guidance of work to be attached to other work held within said work holding member at various predetermined angles.

WILLIAM WIDIVIARK. ALBERT H. BROWNLEE. 

